- P0171 and P0174 both indicate that there is a lean condition present in your Ford Windstar. By themselves, these are some of the most common OBD2 codes. When they appear together, it indicates that the entire engine is running lean. Definition Both of these codes are generic, which means they have the same meaning (Windstar or not).
What causes lean fuel code?
The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture.
What do lean codes mean?
The OBDII trouble code P0171 – System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher.
How do I fix the code P0171 on my Ford?
Remove the mass air flow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass air flow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.
Can bad spark plugs cause a lean code?
No. Lean condition is more air than fuel. Usually a vacuum leak somewhere. Bad spark plugs usually results in a rich condition since the fuel is not being burned fully.
How do I fix my fuel system too lean?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
How do you fix a lean fuel mixture?
Vacuum leak: Vacuum leaks can cause a lean fuel mixture. Inspecting and replacing damaged vacuum lines with good hoses and clamps can solve a lean problem. Clogged fuel filter: clogged fuel filters will limit the amount of fuel requires by the engine.
Can a dirty air filter cause a lean code?
If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.
How can you tell if an oxygen sensor is bad?
Here are some of the most common signs that your oxygen sensor is bad.
- A Glowing Check Engine Light. The bright orange Check Engine light in your dashboard will usually glow if you have a bad oxygen sensor.
- Bad Gas Mileage.
- An Engine That Sounds Rough.
- An Emissions Test Failure.
- An Older Vehicle.
Can a bad O2 sensor cause a lean condition?
So, an oxygen sensor failure can lead to incorrect readings of exhaust gasses. As a result, the faulty sensor can cause, a too rich or too lean condition. Any fuel that leaves the combustion chamber unburned; will enter the exhaust system and light-off when it reaches the catalytic converter.
How much does it cost to fix P0171?
What is the cost to resolve a P0171 code? This code will require a diagnostic check, which will run about $100 depending on the time it takes to find the issue. As there is a laundry list of reasons why the engine runs lean, the average price per repair will vary greatly.
What causes P0171 and P0174 codes Ford?
COMMON CAUSE: A DIRTY MAF SENSOR One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off.
Can EGR valve cause lean condition?
Unwanted EGR flow at idle, even in very small amounts, causes a type of rough running that may easily be misidentified as a lean condition (somewhat more likely in MAP-based fuel systems).
Ford Windstar: P0171 and P0174 Diagnosis
P0171 and P0174 are both diagnostic codes that indicate that an alean situation exists in your Ford Windstar. These are some of the most often seen OBD2 codes on their own. When they appear together, it signifies that the engine as a whole is operating at a low efficiency.
This code and the other are generic, which implies that they both have the same meaning (Windstar or not).
- Fuel Trim System Lean – Bank 1: P0171 indicates that the side of the engine with the first cylinder (Bank 1) is running lean
- It is also known as the Bank 1 condition. A P0174 code indicates that the fuel trim system on the side of the engine with the first cylinder (Bank 2) is operating at an excessively lean setting. This code is not accessible on inline engines since there is only one “bank” of cylinders on these engines. The term “lean condition” refers to the fact that the engine is drawing in too much air in comparison to the amount of fuel present. There are a variety of factors that might contribute to a vehicle becoming lean. It might be getting too much air (think vacuum leak, EGR problem, or mass airflow sensor), or it could be receiving too little fuel (think vacuum leak, EGR problem, or mass airflow sensor) (bad injectors, weak fuel pump, dirty fuel filter, bad fuel pressure regulator). Here’s what more you should know:
When the air/fuel combination in the vehicle becomes too lean, the codes P0171 and P0174 are shown. When the oxygen sensors detect that there is insufficient oxygen in the exhaust, they both throw the error. The engine then makes modifications to compensate and generates these codes, which cause the service engine soon light to illuminate on the dashboard. When both of these codes arise at the same time, it is more than likely that the intake manifold gasket is the source of the problem, rather than the engine.
Symptoms:P0171 + P0174 Ford Windstar
Some of these codes aren’t related with poor driving conditions all the time. For the vast majority of individuals, the appearance of the service engine soon light is the first indication that anything is amiss. When your Windstar has codes P0174 and P0171, you will often experience the following symptoms, which indicate that something is amiss.
- Fuel mileage-depending on how much the air fuel combination has altered, it may or may not suffer a reduction. Misfire – If the air fuel combination has deviated too far from the manufacturer’s specifications, the vehicle may misfire or perform poorly. This is frequently used in conjunction with P0300. If you have this code in addition to P0171 and P0174, disregard the P0300 code. It should go away once you’ve resolved the problem with the air/fuel combination. Engine Idling Issues — When the air/fuel mixture is changed, the car might idle irregularly as the computer adapts in order to keep the engine operating. It’s possible that the engine will splutter as well.
The following are the most often seen causes of P0171 and P0174. The most prevalent causes of vacuum leaks are intake manifold leaks (especially at the intake manifold) and the MAF sensor.
The most typical reason for the P0174 or P0171 codes to appear in most cars is a vacuum leak, which is discussed more below. Take a look around to see if you can locate the source of the vacuum leak. You may learn how to discover one by watching this excellent YouTube video. A very high probability of the intake manifold leaking exists if the engine allows unmetered air into the engine. However, the leak might be everywhere. A good scan tool can also assist you in determining whether or not there is a vacuum leak.
However, when you power the engine, the fuel trim should decrease to around 0.
Mass Air Flow Sensor
The most typical reason for the P0174 or P0171 codes to appear in most cars is a vacuum leak, which may be found in many different places. Try to determine the source of the vacuum leak by looking about. Discover out how to find one by watching this excellent YouTube video. A very high probability of the intake manifold leaking exists if the engine allows unmetered air into the combustion chambers. The leak, on the other hand, might occur anywhere. It is possible to detect a vacuum leak with a decent scan tool, which may also be used to identify other problems.
The fuel trim should, however, decrease to roughly 0 when the engine is revved (give or take a few points).
The most typical reason for the P0174 or P0171 codes to appear in most cars is a vacuum leak. Take a look around to see if you can spot the source of the vacuum leak. Find out how to locate one by watching this excellent YouTube video. If the engine is allowing unmetered air into the engine, the intake manifold is extremely likely to be leaking. The leak, on the other hand, may be anywhere.
In addition, a decent scan instrument can assist you in determining whether or not there is a vacuum leak. A vacuum leak will have a significant impact on fuel trim at idling. However, when you power the engine, the fuel trim should drop to around 0. (give or take a few points).
Bad Fuel Injectors
If you have one or more fuel injectors that have failed, this can almost likely result in the air/fuel combination becoming contaminated. P0174 and P0171, on the other hand, imply that BOTH sides of the engine are operating in a lean state. One faulty fuel injector would be enough to cause one of those codes to appear. Both codes might be caused by multiple defective fuel injectors on both sides of the engine; however, this is highly improbable to occur. If you have more than one cylinder-related misfire code (such as P030X, where X represents the misfiring cylinder), it is probable that you have more than one faulty injector in your vehicle.
Fuel Pump/Fuel Filter
Modern fuel-injected engines need a high level of fuel pressure in order to adequately atomize the gas. If the fuel pressure is not as high as it should be, atomization will not occur effectively, and the appropriate air/fuel combination will not be obtained. When the gasoline pump fails or the fuel filter becomes blocked, this is a regular occurrence. It is also possible that the fuel pressure regulator is to blame. The fuel pressure may almost certainly be checked through a port that is accessible.
On the subject, here’s a terrific YouTube video to watch.
Good luck figuring out what is causing your Ford Windstar’s P0171 and P0174 trouble codes to come up and stay on. If you have any suggestions for how to make this post better, please feel free to leave a comment below.
Ford Windstar Questions – P0171, P0174 check engine codes – possible electrical problem?
I have a 1999 Ford Windstar 3.8L with the check engine light illuminated and the codesp0171p0174 shown on the dash. A bachelor’s degree worth of research led me to take a number of steps to troubleshoot and fix the problem, which included: a major tune up, switching out the PCV valve, cleaning and replacing the Egervalve, throttle body, and idle air control, replacing the fuel filter, and inspecting the vacuum hoses, among other things, In addition to being aware of the fact that I can clean my mass air flowsensor and perhaps replace my oxygensensor, I’ve also observed there’s a short in the electrical system in a number of different places around the car.
During driving, the interior cabin lights will come on at random, and I will have to adjust the steering column or open and close the driver’s door in order to switch the lights back on.
I’m starting to wonder whether the checkengine light may be illuminated as a result of an electrical problem causing the oxygen sensor or airflow sensors connections to fail to provide accurate readings.
Any suggestions or assistance would be much appreciated.
Ford Windstar – fixing PO171 and PO174
For example, the Ford P0171 is a LEAN code for cylinder bank 1, while the P0174 is a LEAN code for cylinder bank 2 on the same vehicle. On many Ford cars, these codes are often encountered, and they are set when the powertrain control module (PCM) determines that the air/fuel mixture is running too lean (too much air, not enough fuel). It is possible to find any one of these codes, or both of these codes, when a code reader or scan tool is inserted into the vehicle’s diagnostic port and the Check Engine Light illuminates.
- On Ford cars equipped with a V6 or V8 engine with rear-wheel drive, the cylinder bank on the RIGHT (passenger) side of the engine is designated by the P0171 lean code for bank 1.
- On four-cylinder engines, this code is not activated (no bank 2).
- Depending on the severity of the situation, a low fuel condition may result in lean misfires, a rough idle, reluctance or stumble when accelerating, and/or poor overall engine performance.
- For example, if the problem is that there is not enough gasoline, the root cause might be a weak fuel pump, a limited fuel filter, a leaking fuel pressure regulator, or unclean fuel injectors.
- The MAF sensor is positioned in the air inlet tube, just ahead of the throttle body, and it measures the amount of air entering the engine.
- Dirt can adhere to the MAF sensor wire and form a coating, which reduces the sensor’s ability to respond quickly to changes in airflow.
- The vapors can leave a waxy coating on the sensor wire, which can be difficult to remove.
As a result, the engine operates at a low efficiency and generates the codes P0171 and/or P0174 (see Ford TSB 98-23-10 for details).
In many cases, spraying the sensor element with electronics cleaner will be sufficient to successfully clean the MAF sensor.
Disconnect the air inlet tube immediately ahead of the sensor, and then spray the electronics cleaner through the screen at the wire element in the center of the little MAF sensor, as shown in the illustration.
Allow it to rest for another five minutes before reconnecting the air inlet tube and turning on the ignition.
LEAKS IN THE VACUUM Another typical source of Ford P0171 and P0174 error codes is a vacuum leak in the engine’s intake manifold.
Port gaskets and isolator bolt assemblies for the upper plenum of 3.8L Ford engines with a split-plenum intake manifold can degrade with time, allowing air into the engine.
In addition, the vacuum hose that links the fuel pressure regulator to the intake manifold might expand and leak vacuum where the hose attaches to the manifold due to the buildup of pressure.
SENSOR FOR THE DPFE IS DEFECTIVE.
Once a vehicle has accumulated more than 60,000 miles on the odometer, or if it is more than five or six years old, the failure rate of these sensors becomes quite high.
The sensor’s original equipment enclosure is made of rectangular aluminum and is approximately three inches in length.
It responds by boosting EGR flow, which may cause the EGR valve to remain open for a longer period of time than typical, resulting in a too lean state in the engine.
The most common cause of the P0401 error is a faulty DPFE sensor, rather than a malfunctioning EGR valve or an EGR valve that has been clogged with carbon (though this can also set a P0401 code).
A replacement DPFE sensor from an aftermarket source costs less than $50 and typically eliminates not just the P0401 code, but also the P0171 and P0174 codes, among others. God’s blessings on you.
Ford P0171 & P0174 Lean Codes
Automobile Repair Library, Auto Parts, Accessories, Tools, Manuals and Books, Car BLOG, Links, and more. Index byLarry Carley (c)2019 AA1Car.com All rights reserved. A Ford P0171 LEAN code corresponds to cylinder bank 1, whereas a Ford P0174 LEAN code corresponds to cylinder bank 2. On many Ford cars, these codes are often encountered, and they are set when the powertrain control module (PCM) determines that the air/fuel mixture is running too lean (too much air, not enough fuel). It is possible to find any one of these codes, or both of these codes, when a code reader or scan tool is inserted into the vehicle’s diagnostic port and the Check Engine Light illuminates.
On Ford cars equipped with a V6 or V8 engine with rear-wheel drive, the cylinder bank on the RIGHT (passenger) side of the engine is designated by the P0171 lean code for bank 1.
On four-cylinder engines, this code is not activated (no bank 2).
WHAT A LEAN CODE MEANS
It is possible to have a lean fuel condition when the engine is taking in too much air and/or when the fuel system is not supplying enough fuel. Depending on the severity of the situation, a low fuel condition may result in lean misfires, a rough idle, reluctance or stumble when accelerating, and/or poor overall engine performance. Vacuum leaks, a filthy airflow sensor that is not measuring airflow properly, an EGR valve that is not closing and enabling exhaust to leak into the intake manifold, and an EGR valve that is allowing too much flow are all examples of how unmetered air might enter the engine (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
A clogged MAF sensor might cause a lean code to be generated.
COMMON CAUSE: A DIRTY MAF SENSOR
P0171 and P0174 lean code problems are frequently caused by a filthy mass airflow (MAF) sensor, which is one of the most typical reasons. The MAF sensor is positioned in the air inlet tube, immediately ahead of the throttle body, and it is responsible for measuring air flow. The air filter is supposed to shield the MAF sensor from dust and debris from the outside world, however sometimes the air filter does not fit tightly enough inside the housing, allowing unfiltered air to get through to the engine.
- Additionally, gasoline vapors that accumulate in the intake manifold and throttle body after the engine has been turned off might contaminate the mass air flow sensor (MAF).
- This leads to an underreporting of airflow by the mass airflow sensor (MAF), which in turn causes the powertrain control module (PCM) not to supply enough fuel in order to maintain a correctly balanced air-fuel ratio.
- One method of diagnosing a clogged MAF sensor is to connect a scan tool to the vehicle, choose the PID data option, and examine the fuel trim values while the vehicle is operating.
- If the MAF sensor is clogged, the solution is straightforward: just clean or replace the sensor.
- Any other form of cleanser should not be used since it may cause harm to the sensor.
- Allow the cleaner to soak in for a few minutes before spraying it with another shot of cleaner.
Allow it to rest for another five minutes before reconnecting the air inlet tube and turning on the ignition. It is possible that the MAF sensor will need to be changed if the lean codes keep appearing despite the fact that the engine is not suffering from a vacuum leak or fuel delivery problem.
ANOTHER COMMON CAUSE: VACUUM LEAKS
A vacuum leak in the engine is another typical cause of Ford P0171 and P0174 lean code problems. Vacuum leaks can occur anywhere in the intake pipework that is downstream of the throttle body, including the throttle body itself (throttle body gasket, intake manifold gaskets or vacuum hose connections to the intake manifold) A vacuum leak can be diagnosed with the use of a scan instrument. Connect your tool, start the engine, then choose the PID data menu from the drop-down menu. Take a look at the fuel trim numbers when the engine is running at idle.
- Increase the engine speed to 2500 RPM.
- Ford Technical Service Bulletin 04-17-4 describes the steps to be followed while testing for fuel trim and vacuum leaks.
- This is commonly caused by oil being sucked into the engine through the PCV system.
- According to Ford Technical Service Bulletin 03-16-1, the remedy consists of multiple steps: It is necessary to remove the upper manifold plenum and replace it with a revised one that has less oil vapor drawn into the PCV system.
- Finally, it is necessary to reflash the PCM to make it less sensitive to lean fuel conditions.
ANOTHER POSSIBILITY: LOW FUEL VOLUME DELIVERY
It is also possible to establish lean codes if the engine is not receiving enough gasoline. If you have a weak fuel pump, low voltage to the fuel pump (which stops the fuel pump from spinning quickly enough to produce regular fuel flow), a blocked fuel filter, or a leaky fuel pressure regulator, these might all be contributing factors. Diagnose Fuel Pumpfor additional information on how to solve fuel delivery issues. Diagnose Fuel Pump You may also use a diagnostic program to examine fuel supply issues that may be causing a lean code to appear on your computer screen.
- If the fuel pressure is less than the standards, it is likely that there is a problem with the fuel pump or the fuel pump wiring circuit.
- At idle, the fuel trim may be normal to somewhat positive, depending on the engine.
- It would be reasonable to conclude that there has been no change in fuel trim values and that low fuel volume is not the source of your lean code.
- It is possible that they flow enough fuel at idle and low speed to keep up with engine demand, but that they do not spray enough fuel at higher engine speeds and loads in order to maintain the correct air/fuel ratio.
Cleaning the fuel injectors is the solution for unclean fuel injectors. If the injectors are really unclean, fuel tank additives may be inefficient or even useless, and it may be required to have the injectors professionally cleaned.
IT COULD ALSO BE: A BAD DPFE SENSOR
It is also possible for a defective EGR differential pressure sensor to cause Ford p0171 and p0174 lean faults. Once a vehicle has accumulated more than 60,000 miles on the odometer, or if it is more than five or six years old, the failure rate of these sensors becomes quite high. In addition to being installed on the engine, the DPFE sensor is connected to the tube that conducts exhaust gas to the EGR valve by means of two rubber hoses. The sensor’s original equipment enclosure is made of rectangular aluminum and is approximately three inches in length.
It responds by boosting EGR flow, which may cause the EGR valve to remain open for a longer period of time than typical, resulting in a too lean state in the engine.
The most common cause of the P0401 error is a faulty DPFE sensor, rather than a malfunctioning EGR valve or an EGR valve that has been clogged with carbon (though this can also set a P0401 code).
Click Here to Download or Print This Article.
It is also possible for a defective EGR differential pressure sensor to cause Ford p0171 AND p0174 lean codes. When a vehicle has more than 60,000 miles on the odometer or is more than five or six years old, the failure rate of these sensors is quite high. In addition to being installed on the engine, the DPFE sensor is connected to the tube that conducts exhaust gas to the EGR valve by means of two rubber hoses, as shown in the illustration. With a rectangular aluminum housing of approximately three inches in length, the original equipment sensor is easy to recognize.
It responds by boosting EGR flow, which may cause the EGR valve to remain open for a longer period of time than typical, causing the engine to run lean.
A malfunctioning DPFE sensor, rather than an EGR valve issue or an EGR valve clogged with carbon, is the most common cause of the P0401 code in the majority of situations (though this can also set a P0401 code).
Sparky’s Answers – 2003 Ford Windstar P0171 and P0174, Banks 1 & 2 Lean
The service engine soon light was illuminated on this 2003 Ford Windstar when it was brought in. The checking code showed the numbers P0171 and P0174, indicating that banks 1 and 2 are lean. I looked for vacuum leaks, but none were discovered, so I went on to the Mass Air Flow sensor to complete the inspection. It is normal for them to become soiled, resulting in the appearance of these error codes. Because the MAF sensor is housed within the air filter housing, it had to be removed in order to be replaced.
- Then I was able to free the spring clamp that was holding the two pieces of the frame together.
- It’s located close to the left of the master cylinder and is easily visible.
- Many locks must be unlocked in order for the mission to be completed.
- In addition, there is another wire subharness that has to be removed.
- The sensor was removed from the enclosure using a torx bit socket that was tamper resistant after the two sections had been successfully separated.
- A pick or a tiny screw driver is used to gently wipe the film away, as illustrated in the image above.
- However, I prefer to gently rub it off rather than using a cleaner since I do not want to cause any damage to the delicate portions.
- It’s just a series of various images taken with the same sensor.
- This is only one of many probable explanations.
Ford has issued a Technical Service Bulletin (TSB) for the Windstar from 1999 to 2003. To perform the repair yourself, you must first visit your local parts store or dealership and get a “Valve cover repair kit.” This website link provides detailed step-by-step directions for the repair.
2003 Ford Windstar – P0171 and (P0174) – NEED HELP PLEASE!
Essentially, I am responsible for all of my own upkeep and repairs. The minivan was in excellent condition. During one of the occasional cold periods, I decided to leave it for three days. When I first started it, it ran horribly. The check engine light is flashing. The following codes were assigned to me: P0171, P0302, and P0306. First and foremost, there are misfires: P0302 – There is a broken clip on the injector in this case. As a result, it does not click in. It’s possible that the harness connector slipped up a little.
- The minivan has 232 kilometers on the odometer.
- The PROBLEM code is P0171, and the solution is (P0174).
- The idle is a little harsh.
- Two hoses coming out of the top plenum were found to be dry rotted, so I replaced them.
- Smoke was flowing from behind the plenum, near the number 2 cylinder, and it was alarming.
- The isolator bolt near the number 2 cylinder appeared to be torn, which I thought was odd.
I was 100 percent certain that it was my own fault.
It did not provide a solution to the situation.
Small leak at the point where the vent control hose joins to the junction box That hose was replaced by me.
In the process of replacing the gaskets, I noticed a little chip in the lower clam shell where one of the isolator bolts passes through?
Although I did not want to do so, I was unsure whether or not the chip was to blame for the situation.
I make the decision to thoroughly inspect the EGR system.
Despite the fact that it is for a 4.6 and 5.4L engine.
Everything appeared to be in order.
TEST 2: EGR Valve Vacuum Pump Test – the result was that the engine idle grew worse RESULTS OF TEST 2: DEMONSTRATION OF EGR FLOW SIGNAL FROM DPFE – IF THE VOLTAGE READING ON THE MULTIMETER INCREASED AS I APPLIED VACUUM WITH THE VACUUM PUMP AND DECREASED AS I RELEASED VACUUM, THEN THE DPFE SENSOR IS WORKING CORRECTLY.
TEST 5: Testing the EGR Vacuum Regulator Solenoid (Part 2) – resultengine vacuum was present after the engine was started and was idling, indicating The outcome of TEST 5: Testing the EGR Vacuum Regulator Solenoid (Part 2) was as follows: When the key was switched to the On position, 12 Volts were present.
- Results of TEST 6: Testing the EGR Vacuum Regulator Solenoid (Part 3).
- TEST 7: Checking the DPFE 5 V REFERENCE SIGNAL – the result was a reading of 5 Volts on the multimeter.
- TEST 8: DPFE Sensor Ground Return – the result was a reading of 10-12 Volts on a multimeter.
- If you have arrived at this point in the testing process by completing the steps outlined below: When TEST 1 is followed by TEST 2, followed by TEST 7, the result shows that the DPFE sensor is defective.
- In general, all eight tests were successful.
- There has been no modification in the trim.
- The pressure setting for the on position was 35 psi (alldata 35-45 psi) Running 32 psi (alldata 28-45 psi)?
I have never replaced the gasoline filter on my 232K vehicle before.
The pressure setting for the on position was 25 psi (alldata 35-45 psi) Running at a pressure of 35 psi (alldata 28-45 psi) The gauge had a small amount of leakage at the fitting.
What was I thinking when I didn’t double-check the key’s position?
The trims remained unchanged.
It was determined that the PCM signal was 5VI by back probing the MAF and checking the voltage.
According to the footage I’ve seen, the voltage coming from the MAF seems to be correct in my opinion.
There has been no change in trimming.
There are no leaks everywhere.
Yes, it did.
By the way, when I replaced the intake manifold gasket after 190,000 miles, I also replaced the injectors with new ones.
According to Alldata 11.4 – 12.6 ohms are used.
512.5 – 12.6 ohms is the resistance range.
Would the fact that 1-4 is over the range have an impact on the fuel trim?
190k was the point where I replaced the bushing as well (Ford OEM).
I did not carry out a compression test in this case.
Closed loop operation is being performed, and the downstream O2 sensors on both banks are being held at 0.8.RPM 2489MAF g/s 21.6 Coolant 174.2FVE 23.0 percent STFT1-0.8 percent STFT 20.0 percent LTFT112.5 percent LTFT210.9 percent RPM 1345MAF g/s 9.7 percent STFT1-0.8 percent STFT 20.0 percent LTFT112.5 percent LTFT210.9 percent Coolant 170.6FVE 21.0 percent STFT1-7.0 percent STFT2-2.3 percent LTFT113.3 percent LTFT213.3 percent RPM 729MAF g/s 6.0Coolant 167.0FVE 21.0 percent STFT1-2.3 percent STFT2-2.3 percent LTFT122.7 percent LTFT219.5 percent RPM 729MAF g/s 6.0Coolant 167.0FVE 21.0 percent STFT1-2.3 percent STFT2-2.3 percent LTFT Two further observations:- There is a sound in the middle of the plenum that sounds like a vacuum leak, which may be coming from within.
The engine clanks for a few of seconds when you switch off the minivan after it has reached full temperature.- When you apply the throttle, the engine clanks for a brief second.
I’ve only lately started. I’m not sure whether clank is an acceptable term to use here. It’s like a light knocking on the door. Any assistance would be much appreciated! I’m starting to run out of alternatives.
Windstar with codes P0171 and P0174
I hope this has been of assistance. In the case of this code, there is a Technical service bulletin. It’s right here. Article No.03-16-108/18/03 of the New York Times VARIOUS DIAGNOSTIC () TROUBLE CODES (DTCS) P0171/P0174 STORED IN MEMORY -VEHICLES EQUIPPED WITH 3.8L INLINE-SIZE ENGINE ^ MALFUNCTION INDICATOR LAMP (MIL) – MILILLUMINATED WITH DIAGNOSTIC TROUBLECODES (DTCS) P0171/P0174 STORED INMEMORY – VEHICLES EQUIPPED WITH 3.8LENGINEFORD: 1999-2003 MALFUNCTION INDICATOR LAMP (MIL) – MILILLUMINATED WITH DIAGNOSTIC TROUBLECODES (DTCS) WINDSTAR Articles 03-4-7 and 00-21-8 of the TSB are superseded by this TSB.
- ISSUES It is possible that some cars will have a check engine () light on as well as lean Diagnostic Trouble Codes (DTCs) P0171/P0174 (system too lean bank 1 or 2) recorded in their computer memory.
- For further information, please see the Service Procedure that follows.
- This situation can be intermittent and may not be noticeable until the engine has been thoroughly warmed up.
- In addition to the gasket (9H486) between the upper and lower intake manifold assemblies, a vacuum leak () can be caused by a loss of tension at the isolator bolt assemblies (9S479) caused by contamination of the rubber grommets as a result of excessive oil pulling on the rubber grommets.
- If the codes P0171 and P0174 are the only ones saved in the PCM, then go to the next section of this article.
- Customers are the only ones who can see the images.
- There is no such thing as a formalized euphemism (ALL 1999-2003).
- It is not necessary to replace the PCM.
- Inspect the vacuum line from the intake manifold to the fuel pressure regulator for looseness, leaks, and/or oil contamination, and replace the Vacuum Line (XF2Z-9E498-DD) if necessary, according to the manufacturer’s specifications.
There is a formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized (1999-2000 ONLY).
- Examine the LH Valve Cover, which should be a (3F2Z-6582-BA ()) part number.
- NOTE: For a description of the old-style valve cover, please see the accompanying NOTE.
- Remember to check the LH VALVE COVER to see whether it has already been updated to the most recent level using a SHOP LIGHT () or FLASHLIGHT before continuing.
- AS YOU LOOK THROUGH THE PCV HOLE, THE OLD STYLE VALVE COVER BAFFLE HAS A 3/16″ DIAMETER HOLE IN THE 5:00 O’CLOCK POINT AS YOU LOOK THROUGH THE PCV HOLE (FIGURE 1).
- Using just port gaskets (9H486) and isolator bolt assemblies, remove the top intake and install the new ones (9S479).
- Do not utilize the old isolator bolt assemblies (XF2Z-AA).
- Refer to Section 303-01, Intake Manifold-Upper, of the Workshop Manual for further information.
a formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized formalized (ALL 1999-2003).
- During the removal of the upper intake manifold, make sure that the Exhaust Gas Recirculation (EGR) orifices that are forced into each primary port of the lower intake manifold function properly.
- TO PREVENT VACUUM LEAKS, DO NOT USE SMOKE DETECTION, PROPANE GAS (), OR CARB CLEANER TO TEST FOR THEM.
- It is normal for some leakage to occur from the IDLE AIR CONTROL (IAC) or EGR VALVE, as well as the IMRC SEALS ().
- Please keep in mind that this condition might also be caused by warm ambient temperatures and the use of winter grade fuels, which have a high volatility and may boil in the fuel lines (VAPOR LOCK) during a brief hot soak.
- In the event that nonoxygenated fuel is not available, use mid/high octane fuels, which have lower volatility and may be able to help alleviate the condition if used properly.
- Choose a conspicuous location near to the Vehicle Emission () Control Information Decal where the Authorized Modifications Decal may be displayed prominently and easily seen.
BLOCKING PARTS AND/OR OTHER APPLICABLE ARTICLES The following are NONESUPERSEDES: 00-21-8, 03-4-7 The vehicle is eligible for warranty coverage under the provisions of the Bumper to Bumper Warranty Coverage and Emissions () Warranty Coverage.
2000 Ford Windstar 3.8 P0171 P0174
Posted in:Engine Electrical, Featured, Ford, Fuel System, General Discussion Both banks of trouble codes for a low fuel system were present in the vehicle. This means that there is an issue with the overall engine. When it comes to fuel trim problems, freeze frame data is a wonderful place to start. The data from a freeze frame suggests that fault codes were set during idle. During a test drive, the fuel trim was monitored to check that the car was running low at idle. Take note that the graphs below show that the system is running lean during idle.
This was an example of how a vacuum leak may be found.
Following that, I chatted with the mechanic who was now working on the Windstar 900.
He discovered a leaky intake manifold, as well as a TSB.
I immediately went through his work and found it to be satisfactory.
Fuel control was only affected by propane at the intake manifold runner control bushing, which was the only place where it could be.
The leak is still there despite the installation of a new lower intake manifold.
They had not done so.
After installing the PCM software update, I drove the car to ensure that it was now operating under correct fuel management.
A quarter of the way there was a store.
All it took was a simple software update to do the job.